Frame-positioning device for mounting canvas and like material

Abstract

A frame-positioning device for mounting and stretching canvas and like materials that must be stretch-mounted to a supporting stretcher-frame structure, generally comprising a four-sided wooden frame member, whereby the canvas is stapled thereto. The frame-positioning means includes a pair of stretcher bar holders which are arranged to be slidably received on the structural-beam member of a canvas-stretching-and-mounting apparatus, so as to be adjustable in vertical and horizontal planes along the beam to accommodate various sizes of frames.

I claim: 
     
       1. A frame-positioning device for mounting and stretching canvas and like materials that are stretch-mounted to a supporting stretcher frame, in combination with a canvas-stretching-and-mounting apparatus, wherein the frame-positioning device comprises: a pair of oppositely disposed stretcher-bar holders slidably mounted to said canvas-stretching-and-mounting apparatus and adjustably spaced apart from each other to support said stretcher frame thereon;   means for slidably mounting said stretcher-bar holders along the longitudinal plane of said apparatus to support said frame relative to said apparatus; and   means for adjusting said stretcher-bar holders in a vertical plane to position the side frame vertically with respect to said apparatus, whereby the canvas mounted on said frame is stretched tightly across said frame.   
     
     
       2. A frame-positioning device as recited in claim 1, wherein each of said stretcher-bar holders includes: a substantially flat elongated body member;   an elongated slot disposed longitudinally within said body member; and   a cam-surface head member adapted to engage said stretcher frame when said canvas is stretched across said frame.   
     
     
       3. A frame-positioning device as recited in claim 2, wherein said cam-surface head is formed having a substantially "C"-shaped configuration, defining a cam surface and a flat extended portion to support said frame thereon. 
     
     
       4. A frame-positioning device as recited in claim 1, wherein said slidable mounting means comprises a lug member slidably mounted to the front wall of said apparatus and adapted to couple with said stretcher-bar holder. 
     
     
       5. A frame-positioning device as recited in claim 4, wherein said slidable mounting means further includes a longitudinal channel formed in said front wall of said apparatus to slidably receive said lug member therein, whereby said stretcher bar holders are adjustable horizontally thereon. 
     
     
       6. A frame-positioning device as recited in claim 2, wherein said vertical-adjusting means comprises: a keyed surface formed on one side of said flat elongated body member;   a matching keyed surface formed on said lug member to engage said keyed surface of said body member;   a threaded pin projecting from said lug member and adapted to pass through said slot; and   a nut member received on said threaded pin to couple said stretcher-bar holder to said lug in a vertical position.